You must have heard many people saying that snowfall has started on the mountains, which means the cold is going to increase. Now the thing to think about is that how does snowfall that occurs hundreds of kilometers away affect the plains like Delhi? Meaning, if snow falls on the Himalayan regions, then why does its impact extend to the plains like Delhi, Punjab, Uttar Pradesh, Haryana? What is the science behind this? Let us know…
Winds have a special role
Winds play a big role in bringing coolness from hilly areas like Himalayas to the plains. The Himalayas in the north of India stop the cold winds coming from China and Russia, but they are not able to stop the winds coming from the west. These winds reach India via Pakistan and Afghanistan instead of through the Arabian Sea, due to which their effect is more visible in North India. These winds coming from the Mediterranean Sea affect the plains of India. These winds carry moisture with them, whose effect extends from the Himalayas to the plains of India. These winds cause rain in the plains, but these winds cause snowfall in the Himalayas, due to which the temperature there falls significantly.
Winds also have rules for blowing
There is a rule for the flow of winds. As the part of the earth gets hotter, cold winds come to take its place. Actually, hot air is lighter than cold air. Therefore, hot winds always rise upward and spread. When these winds leave a place, cold air comes to take their place. For this reason, as soon as December starts, the plains start getting affected by cold. Actually, after snowfall starts on the mountains, the temperature there decreases considerably, due to which the winds become very cold and dense and start blowing towards the hot plains.
Winds show effect in a day or two
Suppose there has just been snow in the hilly areas like the Himalayas, does its effect immediately start appearing in the plains? It’s not like that. Cold winds take one to two days to reach the hot plains, after which a cold wave begins in the plains.
